A cash book is used to record all cash transactions and serves as both a journal and ledger for cash and bank accounts. It has debit and credit sides, with receipts recorded on the debit side and payments on the credit side. The cash book can take different forms depending on the number of accounts recorded, from simple to double or triple column formats. The objectives of a cash book include finding total receipts and payments, ascertaining balances, and verifying cash on hand and in the bank.